wlroots/examples/tablet.c

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#define _XOPEN_SOURCE 600
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <wayland-server-core.h>
#include <wlr/backend.h>
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#include <wlr/backend/session.h>
#include <wlr/render/allocator.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_matrix.h>
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#include <wlr/types/wlr_output.h>
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#include <wlr/types/wlr_input_device.h>
#include <wlr/types/wlr_keyboard.h>
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#include <wlr/types/wlr_tablet_pad.h>
#include <wlr/types/wlr_tablet_tool.h>
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#include <wlr/util/box.h>
#include <wlr/util/log.h>
#include <xkbcommon/xkbcommon.h>
struct sample_state {
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struct wl_display *display;
struct wlr_renderer *renderer;
struct wlr_allocator *allocator;
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bool proximity, tap, button;
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double distance;
double pressure;
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double x, y;
double x_tilt, y_tilt;
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double width_mm, height_mm;
double ring;
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struct wl_list link;
float tool_color[4];
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float pad_color[4];
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struct timespec last_frame;
struct wl_listener new_output;
struct wl_listener new_input;
struct wl_list tablet_tools;
struct wl_list tablet_pads;
};
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struct tablet_tool_state {
struct sample_state *sample;
struct wlr_input_device *device;
struct wl_listener destroy;
struct wl_listener axis;
struct wl_listener proximity;
struct wl_listener tip;
struct wl_listener button;
struct wl_list link;
void *data;
};
struct tablet_pad_state {
struct sample_state *sample;
struct wlr_input_device *device;
struct wl_listener destroy;
struct wl_listener button;
struct wl_listener ring;
struct wl_list link;
void *data;
};
struct sample_output {
struct sample_state *sample;
struct wlr_output *output;
struct wl_listener frame;
struct wl_listener destroy;
};
struct sample_keyboard {
struct sample_state *sample;
struct wlr_input_device *device;
struct wl_listener key;
struct wl_listener destroy;
};
static void output_frame_notify(struct wl_listener *listener, void *data) {
struct sample_output *sample_output = wl_container_of(listener, sample_output, frame);
struct sample_state *sample = sample_output->sample;
struct wlr_output *wlr_output = sample_output->output;
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
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int32_t width, height;
wlr_output_effective_resolution(wlr_output, &width, &height);
wlr_output_attach_render(wlr_output, NULL);
wlr_renderer_begin(sample->renderer, wlr_output->width, wlr_output->height);
wlr_renderer_clear(sample->renderer, (float[]){0.25f, 0.25f, 0.25f, 1});
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float distance = 0.8f * (1 - sample->distance);
float tool_color[4] = { distance, distance, distance, 1 };
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for (size_t i = 0; sample->button && i < 4; ++i) {
tool_color[i] = sample->tool_color[i];
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}
float scale = 4;
float pad_width = sample->width_mm * scale;
float pad_height = sample->height_mm * scale;
float left = width / 2.0f - pad_width / 2.0f;
float top = height / 2.0f - pad_height / 2.0f;
const struct wlr_box box = {
.x = left, .y = top,
.width = pad_width, .height = pad_height,
};
wlr_render_rect(sample->renderer, &box, sample->pad_color,
wlr_output->transform_matrix);
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if (sample->proximity) {
struct wlr_box box = {
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.x = (sample->x * pad_width) - 8 * (sample->pressure + 1) + left,
.y = (sample->y * pad_height) - 8 * (sample->pressure + 1) + top,
.width = 16 * (sample->pressure + 1),
.height = 16 * (sample->pressure + 1),
};
float matrix[9];
wlr_matrix_project_box(matrix, &box, WL_OUTPUT_TRANSFORM_NORMAL,
sample->ring, wlr_output->transform_matrix);
wlr_render_quad_with_matrix(sample->renderer, tool_color, matrix);
box.x += sample->x_tilt;
box.y += sample->y_tilt;
box.width /= 2;
box.height /= 2;
wlr_render_rect(sample->renderer, &box, tool_color,
wlr_output->transform_matrix);
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}
wlr_renderer_end(sample->renderer);
wlr_output_commit(wlr_output);
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sample->last_frame = now;
}
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static void tablet_tool_axis_notify(struct wl_listener *listener, void *data) {
struct tablet_tool_state *tstate = wl_container_of(listener, tstate, axis);
struct wlr_event_tablet_tool_axis *event = data;
struct sample_state *sample = tstate->sample;
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if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X)) {
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sample->x = event->x;
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}
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
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sample->y = event->y;
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}
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_DISTANCE)) {
sample->distance = event->distance;
}
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_PRESSURE)) {
sample->pressure = event->pressure;
}
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_TILT_X)) {
sample->x_tilt = event->tilt_x;
}
if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_TILT_Y)) {
sample->y_tilt = event->tilt_y;
}
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}
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static void tablet_tool_proximity_notify(struct wl_listener *listener, void *data) {
struct tablet_tool_state *tstate = wl_container_of(listener, tstate, proximity);
struct wlr_event_tablet_tool_proximity *event = data;
struct sample_state *sample = tstate->sample;
sample->proximity = event->state == WLR_TABLET_TOOL_PROXIMITY_IN;
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}
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static void tablet_tool_button_notify(struct wl_listener *listener, void *data) {
struct tablet_tool_state *tstate = wl_container_of(listener, tstate, button);
struct wlr_event_tablet_tool_button *event = data;
struct sample_state *sample = tstate->sample;
if (event->state == WLR_BUTTON_RELEASED) {
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sample->button = false;
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} else {
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sample->button = true;
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for (size_t i = 0; i < 3; ++i) {
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if (event->button % 3 == i) {
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sample->tool_color[i] = 0;
} else {
sample->tool_color[i] = 1;
}
}
}
}
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static void tablet_pad_button_notify(struct wl_listener *listener, void *data) {
struct tablet_pad_state *pstate = wl_container_of(listener, pstate, button);
struct wlr_event_tablet_pad_button *event = data;
struct sample_state *sample = pstate->sample;
float default_color[4] = { 0.5, 0.5, 0.5, 1.0 };
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if (event->state == WLR_BUTTON_RELEASED) {
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memcpy(sample->pad_color, default_color, sizeof(default_color));
} else {
for (size_t i = 0; i < 3; ++i) {
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if (event->button % 3 == i) {
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sample->pad_color[i] = 0;
} else {
sample->pad_color[i] = 1;
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}
}
}
}
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static void tablet_pad_ring_notify(struct wl_listener *listener, void *data) {
struct tablet_pad_state *pstate = wl_container_of(listener, pstate, ring);
struct wlr_event_tablet_pad_ring *event = data;
struct sample_state *sample = pstate->sample;
if (event->position != -1) {
sample->ring = -(event->position * (M_PI / 180.0));
}
}
static void tablet_tool_destroy_notify(struct wl_listener *listener, void *data) {
struct tablet_tool_state *tstate = wl_container_of(listener, tstate, destroy);
wl_list_remove(&tstate->link);
wl_list_remove(&tstate->destroy.link);
wl_list_remove(&tstate->axis.link);
wl_list_remove(&tstate->proximity.link);
wl_list_remove(&tstate->button.link);
free(tstate);
}
static void tablet_pad_destroy_notify(struct wl_listener *listener, void *data) {
struct tablet_pad_state *pstate = wl_container_of(listener, pstate, destroy);
wl_list_remove(&pstate->link);
wl_list_remove(&pstate->destroy.link);
wl_list_remove(&pstate->ring.link);
wl_list_remove(&pstate->button.link);
free(pstate);
}
static void output_remove_notify(struct wl_listener *listener, void *data) {
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struct sample_output *sample_output = wl_container_of(listener, sample_output, destroy);
wl_list_remove(&sample_output->frame.link);
wl_list_remove(&sample_output->destroy.link);
free(sample_output);
}
static void new_output_notify(struct wl_listener *listener, void *data) {
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struct wlr_output *output = data;
struct sample_state *sample = wl_container_of(listener, sample, new_output);
wlr_output_init_render(output, sample->allocator, sample->renderer);
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struct sample_output *sample_output = calloc(1, sizeof(struct sample_output));
sample_output->output = output;
sample_output->sample = sample;
wl_signal_add(&output->events.frame, &sample_output->frame);
sample_output->frame.notify = output_frame_notify;
wl_signal_add(&output->events.destroy, &sample_output->destroy);
sample_output->destroy.notify = output_remove_notify;
struct wlr_output_mode *mode = wlr_output_preferred_mode(output);
if (mode != NULL) {
wlr_output_set_mode(output, mode);
}
wlr_output_commit(output);
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}
static void keyboard_key_notify(struct wl_listener *listener, void *data) {
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struct sample_keyboard *keyboard = wl_container_of(listener, keyboard, key);
struct sample_state *sample = keyboard->sample;
struct wlr_event_keyboard_key *event = data;
uint32_t keycode = event->keycode + 8;
const xkb_keysym_t *syms;
int nsyms = xkb_state_key_get_syms(keyboard->device->keyboard->xkb_state,
keycode, &syms);
for (int i = 0; i < nsyms; i++) {
xkb_keysym_t sym = syms[i];
if (sym == XKB_KEY_Escape) {
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wl_display_terminate(sample->display);
}
}
}
static void keyboard_destroy_notify(struct wl_listener *listener, void *data) {
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struct sample_keyboard *keyboard = wl_container_of(listener, keyboard, destroy);
wl_list_remove(&keyboard->destroy.link);
wl_list_remove(&keyboard->key.link);
free(keyboard);
}
static void new_input_notify(struct wl_listener *listener, void *data) {
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struct wlr_input_device *device = data;
struct sample_state *sample = wl_container_of(listener, sample, new_input);
switch (device->type) {
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case WLR_INPUT_DEVICE_KEYBOARD:;
struct sample_keyboard *keyboard = calloc(1, sizeof(struct sample_keyboard));
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keyboard->device = device;
keyboard->sample = sample;
wl_signal_add(&device->events.destroy, &keyboard->destroy);
keyboard->destroy.notify = keyboard_destroy_notify;
wl_signal_add(&device->keyboard->events.key, &keyboard->key);
keyboard->key.notify = keyboard_key_notify;
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struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
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if (!context) {
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wlr_log(WLR_ERROR, "Failed to create XKB context");
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exit(1);
}
struct xkb_keymap *keymap = xkb_keymap_new_from_names(context, NULL,
XKB_KEYMAP_COMPILE_NO_FLAGS);
if (!keymap) {
wlr_log(WLR_ERROR, "Failed to create XKB keymap");
exit(1);
}
wlr_keyboard_set_keymap(device->keyboard, keymap);
xkb_keymap_unref(keymap);
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xkb_context_unref(context);
break;
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case WLR_INPUT_DEVICE_TABLET_PAD:;
struct tablet_pad_state *pstate = calloc(sizeof(struct tablet_pad_state), 1);
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pstate->device = device;
pstate->sample = sample;
pstate->destroy.notify = tablet_pad_destroy_notify;
wl_signal_add(&device->events.destroy, &pstate->destroy);
pstate->button.notify = tablet_pad_button_notify;
wl_signal_add(&device->tablet_pad->events.button, &pstate->button);
pstate->ring.notify = tablet_pad_ring_notify;
wl_signal_add(&device->tablet_pad->events.ring, &pstate->ring);
wl_list_insert(&sample->tablet_pads, &pstate->link);
break;
case WLR_INPUT_DEVICE_TABLET_TOOL:
sample->width_mm = device->width_mm == 0 ?
20 : device->width_mm;
sample->height_mm = device->height_mm == 0 ?
10 : device->height_mm;
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struct tablet_tool_state *tstate = calloc(sizeof(struct tablet_tool_state), 1);
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tstate->device = device;
tstate->sample = sample;
tstate->destroy.notify = tablet_tool_destroy_notify;
wl_signal_add(&device->events.destroy, &tstate->destroy);
tstate->axis.notify = tablet_tool_axis_notify;
wl_signal_add(&device->tablet->events.axis, &tstate->axis);
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tstate->proximity.notify = tablet_tool_proximity_notify;
wl_signal_add(&device->tablet->events.proximity, &tstate->proximity);
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tstate->button.notify = tablet_tool_button_notify;
wl_signal_add(&device->tablet->events.button, &tstate->button);
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wl_list_insert(&sample->tablet_tools, &tstate->link);
break;
default:
break;
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}
}
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int main(int argc, char *argv[]) {
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wlr_log_init(WLR_DEBUG, NULL);
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struct wl_display *display = wl_display_create();
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struct sample_state state = {
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.display = display,
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.tool_color = { 1, 1, 1, 1 },
.pad_color = { 0.5, 0.5, 0.5, 1.0 }
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};
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wl_list_init(&state.tablet_pads);
wl_list_init(&state.tablet_tools);
struct wlr_backend *wlr = wlr_backend_autocreate(display);
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if (!wlr) {
exit(1);
}
wl_signal_add(&wlr->events.new_output, &state.new_output);
state.new_output.notify = new_output_notify;
wl_signal_add(&wlr->events.new_input, &state.new_input);
state.new_input.notify = new_input_notify;
clock_gettime(CLOCK_MONOTONIC, &state.last_frame);
state.renderer = wlr_renderer_autocreate(wlr);
if (!state.renderer) {
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wlr_log(WLR_ERROR, "Could not start compositor, OOM");
exit(EXIT_FAILURE);
}
state.allocator = wlr_allocator_autocreate(wlr, state.renderer);
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if (!wlr_backend_start(wlr)) {
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wlr_log(WLR_ERROR, "Failed to start backend");
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wlr_backend_destroy(wlr);
exit(1);
}
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wl_display_run(display);
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wl_display_destroy(display);
}